Improved handling of keyword syntax highlighting.

We should be explictly looking for an end of word marker, otherwise we
can get situations like '(dothis)' only highlighting the 'do' part of
the string.

Addressed Bug #3.
Syntax-highlighting: Unlike the Lisps I'm used to LispyScript allows single-quoted strings.

Addresses bug #3.
Version 0.3.6.
Improved README.